/Engine/Source/Runtime/Engine/Public/Internationalization/EnginePackageLocalizationCache.h
Find all of the packages using the given asset group class, and update the PackageNameToAssetGroup map with the result.
virtual void FindAssetGroupPackages ( const [FName](API\Runtime\Core\UObject\FName) InAssetGroupName, const [FTopLevelAssetPath](API\Runtime\CoreUObject\UObject\FTopLevelAssetPath) & InAssetClassName )